Hi! New here, and just getting started but I am mostly stuck on some kiosk related issues.

We use a smart card with integrated certificates are used to login to websites. Is there any functionality in Porteus to enable a browser like Firefox to use the smartcard? We're trying to kiosk this process so users can just drop by, do one updates on a touchscreen tablet and then move on without anything residual left behind.

Unfortunately i have no experience with such hardware. Perhaps you could try to get it working under Ubuntu first as its unlocked and you can install whatever is needed.
Once you get it working i could add required software to kiosk through customized builds service.